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25 lines
998 B
Haskell
25 lines
998 B
Haskell
module Diffing.Algorithm.SES.Spec where
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import Data.These
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import Diffing.Algorithm.SES
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import Test.Hspec
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import Test.Hspec.LeanCheck
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spec :: Spec
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spec = do
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describe "ses" $ do
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prop "returns equal lists in These" $
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\ as -> (ses (==) as as :: EditScript Char Char) `shouldBe` zipWith These as as
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prop "returns deletions in This" $
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\ as -> (ses (==) as [] :: EditScript Char Char) `shouldBe` fmap This as
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prop "returns insertions in That" $
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\ bs -> (ses (==) [] bs :: EditScript Char Char) `shouldBe` fmap That bs
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prop "returns all elements individually for disjoint inputs" $
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\ as bs -> length (ses (==) ((,) 0 <$> as :: [(Int, Char)]) ((,) 1 <$> bs :: [(Int, Char)])) `shouldBe` length as + length bs
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prop "is lossless w.r.t. both input elements & ordering" $
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\ as bs -> foldr (\ each (as, bs) -> these (flip (,) bs. (:as)) ((,) as . (:bs)) (\ a b -> (a:as, b:bs)) each) ([], []) (ses (==) as bs :: EditScript Char Char) `shouldBe` (as, bs)
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